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"Each year, they look to get better. Without doubt they are one of the two or three best sides. They've got a great coach on the bench and extraordinary players all over the field.

"Cristiano is their best player, but look out for the others: [Paulo] Dybala is already really good and he's getting better, while I love Douglas Costa.

"It's a tough group, but United want to finish top of it."

United host Juventus on Oct. 23 having drawn 0-0 with Valencia last time out in the Champions League. Ronaldo is eligible for the trip to Old Trafford after he served a one-match ban following a red card on his Champions League debut for Juve.

Lukaku, meanwhile, has scored four league goals for United this season, the last strike coming against Watford in a 2-1 win on Sept. 15. The Belgium international's contract at the club runs until 2022.